I was making maybe my 6-7 cast of the fronts piece and the silicone on the mold ripped off on one part. It isn't that big of a deal as the mold had a ton of problems. There were airpockets in the silicone and spots where air was getting trapped. The silicone ultimately failed because it just wasn't thick enough in the spot where it ripped.
I will be redoing it, and making it better.. a very good learning experience.